Banded Tonguefish, Symphurus fasciolaris
The Banded Tonguefish, Symphurus fasciolaris, whose common Spanish name is lengua listada, is a species in the Tonguefish or Cynoglossidae Family, known collectively as lenguas in Mexico. There are sixty six global members of the genus Symphurus, twenty three of which are found in Mexican waters, nine in the Atlantic and fourteen in the Pacific. All family members are left-eyed fish and the lateral line is absent.
The Banded Tonguefish have elongated oval flat bodies that taper to a pointed tail with a body depth that is 28 to 32% of standard length. They have a tan coloration with six to eight fairly subtle wide dark bands and numerous small dark brown oval spots covering their body. Their anal and dorsal fins have indistinct dark bars at the rear and a narrow white outer margin. The tip of their caudal fin is black with a white margin. The inner operculum linings on both sides of their body are darkly pigmented. Their head has a rounded snout with a small curved mouth and small beady eyes on their left side, which are closely set together with the upper eye being slightly in front of the lower eye. Their anal and dorsal fins are confluent with their pointed caudal fin. Their anal fin has 75 to 80 rays. Their dorsal fin originates above the upper eye and has 90 to 97 rays. They only have a left pelvic fin, no pectoral fins, and no lateral lines. Their body is covered with rough scales.
The Banded Tonguefish are found over and within soft sandy and muddy bottoms at depths up to 500 feet. They are uniquely colored to blend with the substratum. They reach a maximum length of 22.0 cm (8.7 inches), as established by the fish photographed below. They feed on small fish and crustaceans. The Banded Tonguefish are seldom seen by humans, poorly studied and very little is known about their behavioral patterns.
In Mexican waters the Banded Tonguefish are found in all waters of the Pacific with the exception that they are absent from Guerrero Negro northward along the central and northwest coasts of Baja.
The Banded Tonguefish can be confused with the Halfspotted Tonguefish, Symphurus atramentatus (wide white bar at base of head and mid-back), the Chocolate Tonguefish, Symphurus callopterus (lacks bands), and the Whitetail Tonguefish, Symphurus oligomerus (lacks bands; wide white tail).
The Banded Tonguefish are small and of limited interest to most.
Banded Tonguefish, Symphurus fasciolaris. Fish provided by the commercial fishermen of the greater Los Cabos area, Baja California Sur, March 2011. Length: 22.0 cm (8.7 inches). This is a length extension for this species previously known to 16.7 cm (6.6 inches).